package com.prd.util;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.prd.config.IdGeneratorSnowflake;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.util.CollectionUtils;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.security.MessageDigest;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.UUID;

/**
 * @Author lizhaoyi
 * @date 2023/10/3 19:26
 * Description:
 */
@Slf4j
public class CommonUtil {

//    private SnowflakeIdWorker

    /**
     * 获取ip
     * @param request
     * @return
     */
    public static String getIpAddr(HttpServletRequest request) {
        String ipAddress = null;
        try {
            ipAddress = request.getHeader("x-forwarded-for");
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("WL-Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getRemoteAddr();
                if (ipAddress.equals("127.0.0.1")) {
                    // 根据网卡取本机配置的IP
                    InetAddress inet = null;
                    try {
                        inet = InetAddress.getLocalHost();
                    } catch (UnknownHostException e) {
                        e.printStackTrace();
                    }
                    ipAddress = inet.getHostAddress();
                }
            }
            // 对于通过多个代理的情况，第⼀个IP为客户端真实IP,多个IP按照','分割
            if (ipAddress != null && ipAddress.length() > 15) {
                // "***.***.***.***".length()
                // = 15
                if (ipAddress.indexOf(",") > 0) {
                    ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
                }
            }
        } catch (Exception e) {
            ipAddress="";
        }
        return ipAddress;
    }

    /**
     * MD5加密
     * @param data
     * @return
     */
    public static String MD5(String data) {
        try {
            java.security.MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] array = md.digest(data.getBytes("UTF-8"));
            StringBuilder sb = new StringBuilder();
            for (byte item : array) {
                sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
            }
            return sb.toString().toUpperCase();
        } catch (Exception exception) {
        }
        return null;
    }


    /**
     * 获取随机数
     * @param lenght
     * @return
     */
    public static String getRandomCode(int lenght){
        String source = "0123456789";
        Random random = new Random();
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < lenght; i++){
            sb.append(source.charAt(random.nextInt(9)));
        }
        return sb.toString();
    }

    /**
     * 获取当前时间戳
     * @return
     */
    public static long getCurrentTimestamp(){
        return System.currentTimeMillis();
    }

    /**
     * 生成32位UUID
     * @return
     */
    public static String generateUUID() {
        return UUID.randomUUID().toString().replaceAll("-","").substring(0,32);
    }

    /**
     * 获取随机长度的串
     * @param length
     * @return
     */
    private static final String ALL_CHAR_NUM = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
    public static String getStringNumRandom(int length) {
        //生成随机数字和字母,
        Random random = new Random();
        StringBuilder saltString = new StringBuilder(length);
        for (int i = 1; i <= length; ++i) {
            saltString.append(ALL_CHAR_NUM.charAt(random.nextInt(ALL_CHAR_NUM.length())));
        }
        return saltString.toString();
    }


    /**
     * 响应数据返回前端
     * @param response
     * @param obj
     */
    public static void sendJsonMessage(HttpServletResponse response, Object obj){
        ObjectMapper objectMapper = new ObjectMapper();
        response.setContentType("application/json; charset=utf-8");
        try (PrintWriter writer = response.getWriter()) {
            writer.print(objectMapper.writeValueAsString(obj));
            response.flushBuffer();
        }catch (IOException e){
            log.warn("响应数据返回前端异常:{}",e);
        }
    }


    /**
     * dto 转换为Do 工具类
     */
    public static <T> T dtoTransfer(Object sourceEntity, Class<T> targetClass) {
        // 判断dto是否为空!
        if (sourceEntity == null) {
            return null;
        }
        // 判断DoClass 是否为空
        if (targetClass == null) {
            return null;
        }
        try {
            T newInstance = targetClass.newInstance();
            BeanUtils.copyProperties(sourceEntity, newInstance);
            // Dto转换Do
            return newInstance;
        } catch (Exception e) {
            return null;
        }
    }

    /**
     * do 转换为Dto 工具类
     */
    public static <T> List<T> dtoListTransfer(List<?> sourceEntityList, Class<T> targetClass) {
        // 判断dto是否为空!
        if (CollectionUtils.isEmpty(sourceEntityList)) {
            return null;
        }
        // 判断DoClass 是否为空
        if (targetClass == null) {
            return null;
        }
        try {
            List<T> objects = new ArrayList<>();
            for (Object object : sourceEntityList) {
                T newInstance = targetClass.newInstance();
                BeanUtils.copyProperties(object, newInstance);
                objects.add(newInstance);
            }
            // Dto转换Do
            return objects;
        } catch (Exception e) {
            return null;
        }
    }
}
